VLBI observations of optically-bright extragalactic radio sources for the alignment of the radio frame with the future Gaia frame - I. Source detectionG. Bourda, P. Charlot, R. W. Porcas and S. T. GarringtonA&A, 520 (2010) A113DOI: https://doi.org/10.1051/0004-6361/201014248
